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Harmless treatment method of arsenic-containing flue dust

A technology of harmless treatment and arsenic fume, which is applied in the field of environmental engineering and science, can solve the problems of storage expansion and secondary pollution of arsenic, and achieve the effects of avoiding storage expansion or production shutdown, high leaching rate, and environmental protection

Active Publication Date: 2014-02-05
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this form of As has greater solubility in water, it is still a harmful residue, which will cause secondary pollution of arsenic
The preparation of white arsenic, copper arsenate or primary metal arsenic is often due to market problems, and there is a problem of inventory increase, which limits the treatment of arsenic-containing fumes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0022] Embodiment 1: The harmless treatment method of the arsenic-containing smoke and dust of the present invention is:

[0023] (1) Heat the water to 90°C, and add As in the water sequentially while stirring 2 o 3 39.6%, Pb18.6%, H 2 O 8% soot from the lead metallurgical process (the solid-to-liquid ratio of arsenic-containing soot to water is 1:7g / ml), hydrogen peroxide (the concentration of hydrogen peroxide is 30wt%, and the amount added is 1.8 times the weight of arsenic in the arsenic-containing soot) And the sulfuric acid of concentration 10wt%, the pH value of sulfuric acid control mixed solution is 1, filter after reacting 2h, obtain the filter cake containing valence metal and the solution containing arsenic acid;

[0024] (2) Add ferric sulfate to the solution containing arsenic acid (addition amount is added according to the weight ratio of iron and arsenic in the solution 0.8:1) and ammonia water, the ammonia water adjusts the pH of the solution to 4, and then ...

Embodiment approach 2

[0026] Embodiment 2: The harmless treatment method of arsenic-containing smoke and dust of the present invention is:

[0027] (1) Heat the water to 75°C, and add As to the water in turn while stirring 2 o 3 35wt% arsenic-containing soot (the solid-to-liquid ratio of arsenic-containing soot to water is 1: 8g / ml), hydrogen peroxide (the concentration of hydrogen peroxide is 25wt%, and the amount added is twice the weight of arsenic in the arsenic-containing soot) and dilute acid ( concentration of 15wt% hydrochloric acid), dilute acid to control the pH value of the mixed solution to 2, filter after 0.5h of reaction, and obtain a filter cake containing valuable metals and a solution containing arsenic acid;

[0028] (2) Add ferric chloride (according to the weight ratio of iron and arsenic in the solution 2.5:1) and ammonia water to the solution containing arsenic acid, and the ammonia water adjusts the pH of the solution to 3, and then at a temperature of 70 ° C Stir and reac...

Embodiment approach 3

[0030] Embodiment 3: The harmless treatment method of arsenic-containing smoke and dust of the present invention is:

[0031] (1) Heat the water to 60°C, add As to the water in turn under stirring 2 o 3 42 wt% arsenic-containing soot (the solid-to-liquid ratio of arsenic-containing soot to water is 1:2g / ml), hydrogen peroxide (the concentration of hydrogen peroxide is 28wt%, and the amount added is 3.0 times the weight of arsenic in the arsenic-containing soot) and dilute acid (Nitric acid with a concentration of 20wt%), the pH of the mixed solution is controlled by dilute acid to be 3, and filtered after reacting for 3 hours to obtain a filter cake containing valuable metals and a solution containing arsenic acid;

[0032] (2) Add ferric nitrate (according to the weight ratio of iron and arsenic in the solution: 2:1) and ammonia water to the solution containing arsenic acid, adjust the pH of the solution to 5 with ammonia water, and then under the condition of 40℃ Stir the ...

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Abstract

The invention relates to a harmless treatment method of arsenic-containing flue dust, and belongs to the environment engineering and science field. The method comprises the following steps: adding a dilute acid and hydrogen peroxide in a water extracting process of the arsenic-containing flue dust to realize acidic oxidation extraction, adding high valence iron having a weight 0.8-2.5 times the weight of arsenic to the obtained extraction liquid to form insoluble arsenic acid iron slag, carrying out high valence iron salt dearsenification, adding high valence iron having a weight 3-6 times the amount of arsenic to the obtained dearsenified high valence iron salt filtrate, adjusting the pH value to 6-9 by using ammonia water, and carrying out depth adsorption dearsenification to obtain a filtrate having an arsenic content lower than a discharge standard of 0.5mg / L to realize the harmless treatment method of arsenic-containing flue dust. The method fully utilizes the high solubility characteristic of pentavalent arsenic, allows the water consumption in the extraction process to be lower than that in the prior art and the temperature of the reaction process to be lower than a boiling temperature, realizes the high extraction rate of arsenic, and reduces the water consumption and the energy consumption.

Description

technical field [0001] The invention relates to a harmless treatment method for arsenic-containing smoke, which belongs to the field of environmental engineering and science. Background technique [0002] Arsenic and its compounds are generally toxic, and their toxicity is notorious to almost every household. However, arsenic and its compounds have a wide range of applications and superior functions in industry. Used as alloy additives to produce lead projectiles, printing alloys, brass (for condensers), battery grids, wear-resistant alloys, high-strength structural steels and corrosion-resistant steels, etc. Brass contains a certain amount of arsenic to prevent dezincification. High-purity arsenic is a raw material for preparing compound semiconductors such as gallium arsenide and indium arsenide, and is also a doping element for semiconductor materials germanium and silicon. Arsenic compounds are also used in the manufacture of pesticides, preservatives, dyes and pharma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/79B01D53/64C02F9/04C02F103/18
Inventor 廖亚龙彭志强周娟
Owner KUNMING UNIV OF SCI & TECH
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